5. The following data are taken from a study investigating the use of a techniqu

Question

5. The following data are taken from a study investigating the use of a technique called radionuclide ventriculography as a diagnostic test for detecting coronary artery disease Assume that the prevalence of coronary artery disease is 0.1 Actual Disease Status Positive Test Negative Test Total CAD Present 302 179 481 CAD Absent 80 372 452 Total 382 551 933 a. b. c. d. What is the sensitivity of the test? What is the specificity of the test? What is the positive predictive value of the test? What is the negative predictive value of the test?

Explanation / Answer

a) sensitivity = 302/(302 + 179) * 100 = 62.79%

b) specificity = 372/(372 + 80) * 100 = 82.3%

c) positive predictive value = 302/(302 + 80) * 100 = 79.06%

d) negative predictive value = 372/(372 + 179) * 100 = 67.51%

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